of all things

of all things idiom
From all the possibilities, as in I said I'd help in any way I can, and of all things they want me to handle publicity. This term, generally expressing surprise, was first recorded in 1925.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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